The Puppet is considered the caretaker of the series' original possessed animatronics and, seemingly, the reason they are possessed in the first place per the Give Gifts, Give Life minigame in FNAF 2.

GAMERS have been begging to know why Bonnie isn't in Friday Night At Freddy's: ... (FNAF) gaming series. 1 ... a secret animatronic antagonist that is comprised of multiple different characters.

RWQFSFASXC, also known as Shadow Bonnie, or RXQ, is a bunny animatronic and a hidden character in FNAF 2. RXQ is a dark, shadow-like animatronic with glowing white eyes and teeth.